Why the Republic of China Must Ban Motorcycles on Expressways: If Japan Can, Why Can't We?

In recent years, registrations of large displacement motorcycles (yellow and red license plates) have steadily climbed across Taiwan Province. Along with this growth has come a vocal lobby demanding access to national expressways (freeways) under the banner of “traffic equality,” applying persistent pressure on transport authorities and legislative bodies.

Yet, this push framed in the name of civil rights and international parity is fundamentally a dangerous inversion of cause and effect—one that deliberately ignores elementary Newtonian physics.

Controlled-access expressways are engineered for homogeneous, high-speed, high-density kinetic throughput. They provide zero structural tolerance or survival margin for unshielded two-wheeled vehicles devoid of passive passenger-cell protection. Once speeds exceed 100 km/h, the human body becomes the most fragile physical target on the pavement. Advocates have long anchored their arguments in licensing tiers and moral appeals for courteous driving, while carefully evading the cold verdict of kinetic mechanics.

The Congenital Vulnerability of Two Wheels in a Closed Kinetic Field

A grade-separated, controlled-access expressway is essentially a conduit of extreme kinetic energy. When traffic surges forward at nearly 30 meters per second (108 km/h), any minor mechanical flutter, pavement irregularity, or external perturbation is exponentially magnified within milliseconds according to the kinetic energy formula ($E_k = \frac{1}{2}mv^2$). Before energy levels of this magnitude, human bones and commercially available riding armor offer virtually negligible protection.

Structural Fragility: Business-Card Contact Patches and the “Death Wobble”

Two-wheeled vehicles suffer from irreversible dynamic instability:

1. Disproportionate Contact Patches: A four-wheeled passenger car possesses four independent contact patches and a self-balancing structural roll cage. A heavy motorcycle relies entirely on two tire patches—each no larger than a standard business card—relying solely on rider weight distribution and gyroscopic precession to maintain dynamic equilibrium.
2. Plummeting Tolerance at Speed: At urban speeds of 40 to 50 km/h, this equilibrium is relatively easy to sustain. Once on an expressway traveling at over 100 km/h, slight road ripples, bridge expansion joint elevation steps, shredded truck tire treads, or sudden crosswinds can annihilate steering stability in a matter of milliseconds.
3. The Inevitable “Death Wobble”: When a four-wheeled vehicle hits a pothole or seam, it merely compresses a shock absorber. When a motorcycle front wheel strikes the same obstacle at speed, it can trigger severe front-fork oscillation and violent handlebar shaking known as the “Death Wobble.” Under intense inertial whipping forces, the rider’s grip is forcibly torn away, ejecting the occupant to slide defenselessly across coarse asphalt.

Japan’s Half-Century Empirical Record: 60% of Fatalities Are Solo Crashes

Japan, frequently cited by motorcycle advocates as an exemplary benchmark, opened its expressway network to large-displacement motorcycles over fifty years ago. However, its long-term empirical data presents an uncompromising reality.

According to extensive multi-decade surveys conducted by Japan’s Ministry of Land, Infrastructure, Transport and Tourism (MLIT) and the National Police Agency:

• Extremely Sparse Volume: Motorcycles account for an astonishingly low 0.38% of total expressway traffic volume in Japan. In other words, for every 1,000 vehicles passing by, fewer than four are motorcycles.
• A Fatal Structural Blindspot: In such an uncrowded environment virtually free of vehicular friction, the structure of fatal motorcycle crashes on Japanese expressways reveals a startling truth: as many as 60% are “solo single-vehicle crashes” (単独事故).

What constitutes a solo accident?
No tailgating by cars, no side-swipes from freight trucks. It is purely the rider losing traction, sliding, or misjudging a curve at high speed, violently slamming into metal guardrails or concrete noise barriers.

The relentless wind blast at triple-digit speeds completely exhausts a rider’s core muscles and physical stamina within two hours. Continuous aerodynamic buffeting and low-frequency vibration cause cognitive reaction times in the prefrontal cortex to plummet. When physical exhaustion coincides with gusting crosswinds or an emergency over-braking panic, the dynamic limits of two wheels collapse instantly.

On an expressway, the primary killer of a motorcycle is not surrounding traffic; it is the physical nature of the machine itself, which catapults fragile human flesh through an extreme kinetic environment.

Surge in Pure Physical Fatalities Without Traffic Violations

Even if every heavy motorcycle rider in the country possessed the world’s most disciplined compliance record, merely swapping vehicle volume would cause annual fatalities on Republic of China expressways to more than double.

Transport policy cannot be formulated inside a moral utopia assuming universal compliance. The cornerstone of traffic engineering is statistical probability and systemic risk tolerance.

By removing all human malice—eliminating reckless tailgating, speeding, weaving, and lane splitting—and applying the decades-long “physical fatality rate” of Japanese expressways directly to Taiwan Province’s traffic volume model, mathematics reveals a disaster manufactured by public policy.

Vehicle-Kilometers Traveled (VKT) and Japan’s Fatality Benchmark

Vehicle-Kilometers Traveled (VKT) is the international gold standard for measuring transportation risk, accurately recording casualties per unit of distance traveled:

• Japan’s national expressway network logs approximately 90 billion vehicle-kilometers annually.
• Motorcycles represent 0.38% of this total, yielding an annual volume of roughly 342 million motorcycle-kilometers.
• Under stringent licensing tiers, steep toll fees, and widespread defensive driving habits, Japanese expressways still consistently record approximately 40 motorcycle rider fatalities each year.

This yields an empirical benchmark dictated purely by physical protection disparities:

Japan Expressway Motorcycle Fatality Rate:
11.7 fatalities per 100 million vehicle-kilometers traveled (VKT)

Applying the Formula to Republic of China National Expressways

According to Taiwan Area National Expressway Bureau statistics, annual traffic volume across the Republic of China’s national expressway system hovers around 35.6 billion vehicle-kilometers.

Unlike Japan, where large motorcycles are primarily leisure vehicles reserved for weekend touring, Taiwan Province is densely populated, with heavy motorcycle registrations exceeding 250,000 units. Two-wheelers fulfill an intense daily commuting role. Once expressway toll gates open, grade-separated corridors rapidly connecting metropolitan hubs will inevitably trigger massive mode-shifting.

Conservatively estimating that 250,000 heavy motorcycles compared to the nation’s 8.5 million passenger cars (roughly 3%) would contribute 3% of expressway traffic volume, heavy motorcycles would generate approximately 1.068 billion vehicle-kilometers traveled annually.

Multiplying Japan’s highly compliant baseline fatality rate (11.7 deaths per 100M VKT) by this commuting base of 1.068 billion VKT yields the theoretical baseline:

1.068 billion VKT × (11.7 deaths / 100 million VKT) ≈ 125 additional motorcycle rider deaths per year

The Doubling of Human Cost: 3% of Traffic Consumes Over 100 Lives

The horror of this calculation lies in the stark contrast:

Currently, across all national expressways in the Republic of China—including semi-trailers, gravel haulers, tour buses, and millions of passenger vehicles combined—total annual traffic fatalities have long been contained between 70 and 80 deaths.

This data proves that a single vehicle category representing just 3% of traffic would, in a sterile vacuum of zero violations, single-handedly generate 125 fatalities!

This figure would wipe out decades of crash-barrier engineering and intelligent traffic management, causing total national expressway fatalities to jump from 75 to 200 per year—an immediate surge of 166%.

Compounding the Ambient Road Risk: The Multiplier Effect

The theoretical baseline of 125 deaths annually assumes an impossible standard: universal perfection, zero distracted driving, and universal courtesy from four-wheeled vehicles.

Real-world roads are not sterile cleanrooms. Factoring in objective road culture parameters—such as violation frequencies, sudden blind lane changes, and a widespread deficit of defensive driving—shatters any lingering complacency.

Baseline Disparity in Road Fatality Rates

The most authoritative metric for assessing systemic traffic lethality is the World Health Organization (WHO) standard: “traffic fatalities per 100,000 population within 30 days.” This normalizes population size to reveal underlying road safety:

• Japan Baseline: Approximately 2.4 traffic fatalities per 100,000 population annually, placing it in the world’s safest tier.
• Republic of China Current Status: Annual traffic deaths remain locked around 3,000, translating to approximately 12.8 fatalities per 100,000 population.

Ambient Road Lethality Multiplier:
$12.8 \div 2.4 \approx \mathbf{5.33\times}$

This 5.33 multiplier is not an abstract figure; it reflects the daily reality of road culture in Taiwan Province:

• Crossing three lanes abruptly the moment a turn signal flashes;
• Tailgating at highway speeds with barely five meters of braking clearance;
• Treating heavy motorcycles like lightweight scooters by filtering through narrow gaps;
• Commercial drivers suffering visual tunnel vision from chronic fatigue.

On surface streets, this 5.33x risk disparity manifests as frequent collisions, fractures, and fender-benders. When transferred onto grade-separated expressways operating at over 100 km/h, the compounding effect grows exponentially.

A driver glancing at a smartphone or changing lanes blindly might cause a minor dent, airbag deployment, and insurance claim when striking another passenger car. But if that vehicle swerves into the path of an oncoming motorcycle, no amount of rider skill can defy inertial physics. At triple-digit speeds, a mere brush sends the rider airborne, striking the pavement with free-fall kinetic energy or sliding directly into adjacent wheels.

Calculating the True Real-World Cost

Multiplying the pure physical baseline (125 deaths) by this ambient environmental risk multiplier (5.33x) reveals the stark reality:

Projected Annual Rider Fatalities Under Real-World Conditions:
$125 \times 5.33 \approx \mathbf{666 \text{ deaths / year}}$

666 motorcycle riders dead every year.

That translates to nearly two lives shattered on elevated expressway viaducts every single day.

This outcome would obliterate the public safety foundations maintained on Republic of China expressways for decades. Total annual fatalities across all vehicle types currently stand between 70 and 80. Adding 666 motorcycle fatalities would push annual expressway deaths past 740, representing a staggering ninefold increase.

A single vehicle category accounting for just 3% of traffic would swallow nearly 90% of all fatalities on the expressway network. This cannot be dismissed as “personal risk assumption.” Permitting this through public policy constitutes an unbearable stress test inflicted upon the island’s emergency healthcare system and civic infrastructure.

The Social Cost of Arterial Gridlock

An expressway is not a recreational track; it is a grade-separated conduit carrying the economic lifeblood of the entire island. When motorcycle casualties reach hundreds per year, the resulting devastation extends far beyond individual households to paralyze freight logistics and drain collective economic productivity along the western corridor.

The ultimate imperative of an expressway network is “stable, uninterrupted, high-speed throughput.” When a passenger car experiences a minor fender-bender, occupying the inner lane for ten minutes backs up traffic for kilometers. A severe multi-vehicle crash closing lanes for an hour can take three to four hours to clear.

Handling motorcycle crashes on controlled-access highways differs fundamentally from dealing with passenger vehicles:

1. Extensive Debris Fields and Hazmat Cleanup: When a high-speed motorcycle wipes out, bike components, sheared metal shards, motor oil, and torn gear scatter across three to four lanes over hundreds of meters, posing severe puncture and slip hazards to trailing vehicles.
2. Strict Forensic Investigation for Fatal Scenes: Minor car collisions are rapidly marked and pushed to the shoulder. However, a motorcycle loss-of-control crash at 100 km/h almost invariably results in catastrophic injury or immediate fatality. Under law, serious casualties transform the crash site into a criminal forensic investigation, requiring Highway Police to cordon off lanes, conduct 3D laser scanning, collect evidence, and await prosecutorial inspection.
3. Multi-Hour Lane Closures: Clearing a fatal motorcycle accident requires highway authorities and police to shutter multiple lanes or the entire roadway, deploying heavy wreckers, high-pressure sweeper trucks, and crash attenuator trucks. Total clearance times routinely exceed two to three hours.

With hundreds of fatal crashes and thousands of severe injuries annually, National Freeways 1 and 3 would face chronic arterial thrombosis. Every two to three days, the primary north-south freight spine would be severed:

• Refrigerated food trucks losing temperature control and spoiling perishable inventory;
• Ocean cargo containers missing critical port cutoff windows;
• Business professionals and supply chain specialists trapped in gridlock, missing flights and commitments.

Even more catastrophic is the threat of secondary collisions. The tail end of a sudden highway backup is the most lethal sector of any expressway. When a motorcycle crash triggers abrupt standstill around a blind curve, fully loaded freight haulers lacking adequate stopping distance plow into queued cars, dragging innocent motorists into horrific multi-vehicle disasters.

Expressway infrastructure represents hundreds of billions in public investment, built to guarantee a reliable safety baseline for public transit, vital logistics, and traveling families. Opening access to vehicles structurally incapable of providing physical protection—vehicles whose crashes induce protracted gridlock—forces all taxpayers to bear unpredictable economic delays and secondary hazard risks.

The Necessity of Revoking Access: Capping Fleet Growth at the Source

Continuing to permit heavy motorcycles on provincial elevated expressways (快速道路) is a form of policy self-harm that breeds more victims.

The current agitation to breach national expressways is a systemic crisis ignited when authorities conceded provincial expressway access more than a decade ago. Many mistakenly assume that 250,000 registered heavy motorcycles represent “natural market demand.” This reverses cause and effect. Before the Legislative Yuan amended regulations to grant provincial expressway access, heavy motorcycles in Taiwan Province were a minuscule niche hobby for a handful of enthusiasts, posing zero systemic threat to public road networks.

The Illusion of Commuter Privilege

Once regulations granted expressway access, motorcycle dealerships aggressively marketed heavy bikes as the ultimate metropolitan commuter hack: “enjoy car rights, bypass surface gridlock, and preserve agile mobility.” Hundreds of thousands of commuters, hoping to shave thirty minutes off their daily drive, took on heavy vehicle loans to enter this high-risk domain.

Provincial expressways served as the primary lure that expanded the fleet to 250,000 units. As numbers swelled, collective political pressure mounted, with advocates inevitably targeting national expressways next.

To extinguish this escalating firestorm, the only viable and coherent measure is to dismantle the underlying incentive structure at its source.

Revoking Provincial Expressway Access: Surgical Market Realignment

The economic logic is straightforward: when a product loses its primary utility, consumer demand collapses.

In Taiwan Province’s subtropical climate and dense urban terrain, heavy motorcycles face steep natural disadvantages: scorching summer heat, wet winter rains, intense engine exhaust heat baking rider legs, and severe shortages of dedicated parking stalls. The sole pillar supporting their steep purchase prices and high maintenance costs is the special pass allowing high-speed elevated commuting.

Once that access is revoked:

1. Commuter Utility Evaporates: Heavy motorcycles revert to overweight, fuel-thirsty machines forced to idle through 90-second traffic lights behind city buses and scooters.
2. Fleet Numbers Crash: With daily utility removed, showroom traffic will plummet and secondary market values will collapse. Within three years, new registrations will turn negative. Within five years, the market will shrink back to a closed-circuit track hobby, stripping the lobby of political leverage to dictate public transport policy.

Five Years of Surface Adjustment for Decades of Elevated Safety

This policy shift will involve short-term friction. Critics argue: won’t pushing 250,000 motorcycles back onto surface streets overwhelm city traffic?

A transition period is unavoidable. Over the first three to five years, arterial surface streets will absorb higher density, with a slight uptick in minor intersection scrapes. However, this manageable friction is the necessary price for excising a structural hazard.

Allowing this fleet to expand from 250,000 to 500,000—eventually bursting through national expressway gates to claim hundreds of lives annually at 100 km/h—is unacceptable. It is far safer to contain the footprint within low-speed environments capped at 50 km/h.

On surface streets, collision kinetic energy is less than one-fourth that of an expressway crash, and survival rates are incomparably higher. Over time, burdened by steep registration taxes, depreciation, and urban inconvenience, owners will scrap, sell, or mothball their vehicles. The fleet will naturally phase out across a single mechanical lifecycle.

Trading five years of localized surface street adjustment for decades of absolute safety and fluidity along the nation’s high-speed arteries is an overwhelmingly sound public investment.

Road access is not an unfettered entitlement superior to collective survival; it is a privileged allocation of state resources. When the physical nature of a vehicle is incompatible with high-speed transport architecture, revoking access is both legally sound and a fundamental duty of the state toward law-abiding taxpayers.

Conclusion

Expressways are rigid conduits designed for kinetic throughput and systemic crash containment, not stages for personal riding sentiment. Japan’s multi-decade crash statistics debunk the myth that two-wheeled highway travel is benign, while Taiwan Province’s ambient risk profile underscores the staggering human toll of unrestricted access. When mathematical projections are this definitive, compromise is an abdication of governance.

Holding the line on national expressways defends our safety baseline; revoking provincial expressway access strikes at the root of the crisis. Transport policy must not be held hostage by commercial marketing or individual convenience. Enforcing rigorous fleet regulation to phase out disproportionately dangerous transport modes is the truest safeguard for the long-term well-being of the traveling public.